Rotor of motor and manufacturing method thereof

Abstract

A rotor of a motor includes a cylindrical magnet having at least one first coupling portion at an inner circumferential surface of the cylindrical magnet; and a rotor core coupled with the cylindrical magnet, the rotor core having at least one second coupling portion at an outer circumferential surface of the rotor core, the at least one second coupling portion being engaged with the corresponding at least one first coupling portion.

1. A rotor of a motor, comprising:
 a cylindrical magnet having at least one first coupling portion at an inner circumferential surface of the cylindrical magnet; and 
 a rotor core coupled with the cylindrical magnet, the rotor core having at least one second coupling portion at an outer circumferential surface of the rotor core, the at least one second coupling portion being engaged with the corresponding at least one first coupling portion, 
 wherein the cylindrical magnet includes a plurality of pieces surrounding the outer circumferential surface of the rotor core, two adjacent pieces of the cylindrical magnet forming the at least one first coupling portion at a junction between the two adjacent pieces. 
 
   
   
     2. The rotor of  claim 1 , wherein the at least one first coupling portion is one of a recess and a protrusion at the inner circumferential surface of the cylindrical magnet, and the at least one second coupling portion is the other one of the recess and the protrusion engaged with the corresponding at least one first coupling portion. 
   
   
     3. The rotor of  claim 2 , wherein the recess is complementary to the corresponding protrusion to receive the corresponding protrusion. 
   
   
     4. The rotor of  claim 2 , wherein the two adjacent pieces of the cylindrical magnet form the one of the recess and the protrusion at the junction between the two adjacent pieces. 
   
   
     5. The rotor of  claim 4 , wherein each of the two adjacent pieces has a half portion of the one of the recess and the protrusion at one end corresponding to the junction. 
   
   
     6. The rotor of  claim 2 , wherein the recess has a recess extending portion and a recess stopping portion, the recess extending portion extending from one of the inner circumferential surface of the cylindrical magnet and the outer circumferential surface of the rotor core, the recess stopping portion extending from an end of the recess extending portion. 
   
   
     7. The rotor of  claim 6 , wherein the protrusion has a protrusion extending portion and a protrusion stopping portion, the protrusion extending portion extending from the other one of the inner circumferential surface of the cylindrical magnet and the outer circumferential surface of the rotor core, the protrusion stopping portion extending from an end of the protrusion extending portion. 
   
   
     8. The rotor of  claim 7 , wherein the protrusion extending portion is substantially straight, and the protrusion stopping portion has one of a substantially circular shape and a substantially triangular shape. 
   
   
     9. The rotor of  claim 6 , wherein the recess extending portion is substantially straight, and the recess stopping portion has one of a substantially circular shape and a substantially triangular shape. 
   
   
     10. The rotor of  claim 2 , wherein the recess and the protrusion are respectively along a longitudinal direction of one of the cylindrical magnet and the rotor core. 
   
   
     11. The rotor of  claim 10 , wherein the recess and the protrusion respectively have a same length as a length of the one of the cylindrical magnet and the rotor core in the longitudinal direction of the one of the cylindrical magnet and the rotor core. 
   
   
     12. The rotor of  claim 10 , wherein the recess and the protrusion respectively have a shorter length than a length of the one of the cylindrical magnet and the rotor core in the longitudinal direction of the one of the cylindrical magnet and the rotor core. 
   
   
     13. A rotor of a motor, comprising:
 a cylindrical magnet having at least one first coupling portion at an inner circumferential surface of the cylindrical magnet; and 
 a rotor core coupled with the cylindrical magnet, the rotor core having at least one second coupling portion at an outer circumferential surface of the rotor core, the at least one second coupling portion being engaged with the corresponding at least one first coupling portion, 
 wherein the first coupling portion is formed in a recess which has a recess extending portion and a recess stopping portion, and the second coupling portion is formed in a protrusion which has a protrusion extending portion and a protrusion stopping portion, 
 wherein the recess extending portion is substantially straight and the recess stopping portion has a substantially triangular shape, and the protrusion extending portion is substantially straight and the protrusion stopping portion has a substantially triangular shape. 
 
   
   
     14. A rotor of a motor, comprising:
 a cylindrical magnet having at least one first coupling portion at an inner circumferential surface of the cylindrical magnet; and 
 a rotor core coupled with the cylindrical magnet, the rotor core having at least one second coupling portion at an outer circumferential surface of the rotor core, the at least one second coupling portion being engaged with the corresponding at least one first coupling portion, 
 wherein the first coupling portion is formed in a recess which has a recess extending portion and a recess stopping portion and the second coupling portion is formed in a protrusion which has a protrusion extending portion and a protrusion stopping portion, 
 wherein the recess extending portion is substantially straight and the recess stopping portion has a substantially circular shape, and the protrusion extending portion is substantially straight and the protrusion stopping portion has one of a substantially circular shape.